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Old 03-04-2014, 07:07 PM   #1 (permalink)
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ASP's CCI thread inserts

Need to rethread grip frame on a sniper. Was on ASP and found the 8 and 10 size by 32 thread inserts. Could not find the drill and tap. Is the male threading proprietary like "helicoil" brand? If not, drill and tap sizes?
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Old 03-04-2014, 07:16 PM   #2 (permalink)
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I just went to ebay and bought one from China, $5 total, and free shipping to Canada The tap your looking for is a 1/4-36
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Old 03-04-2014, 07:19 PM   #3 (permalink)
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Need to rethread grip frame on a sniper. Was on ASP and found the 8 and 10 size by 32 thread inserts. Could not find the drill and tap. Is the male threading proprietary like "helicoil" brand? If not, drill and tap sizes?
Its a standard size, just not common if I remember corectly. I want to say 1/4-36 nef
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Old 03-04-2014, 07:44 PM   #4 (permalink)
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Drill size?
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Old 03-04-2014, 08:34 PM   #5 (permalink)
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Drill size?
Google it. I dont remember off hand.
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Old 03-05-2014, 11:05 AM   #6 (permalink)
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WARNING: I'm not in any way a machinist. I would wait for someone to confirm.

List of drill and tap sizes - Wikipedia, the free encyclopedia
So ~7/32 is my guess by that. They list it for 1/4-28.



Drill Sizes Cross Reference Chart
#2 by that for 1/4" - 36.


This one has a calculator:
Tap Drill Sizes
Their chart says #3 (for approx. 75% thread).


By drill bit # sizes, I presume they mean the gauge number.
Drill bit sizes - Wikipedia, the free encyclopedia

I assume that because:

#2 = 22.1% of 1" by their chart.

So 0.221 * .0254m = 5.61mm

and 7/32 = .219 which is roughly .221
7/32 * .0254m = 5.56mm

So, the numbers are all *roughly* equivalent. Which, in machinist talk, means they're completely different. Unless you're doing something "super sensitive," my guess it would be "good enough."


It's been ........ a while ........ since I took high school shop class so, again, I would wait for confirmation on those numbers. We were much more "eh, it'll do" in my shop class.
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Old 03-10-2014, 09:21 PM   #7 (permalink)
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Going with a #2
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